You are looking at the HTML representation of the XML format.
HTML is good for debugging, but is unsuitable for application use.
Specify the format parameter to change the output format.
To see the non HTML representation of the XML format, set format=xml.
See the complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query-continue>
    <alltransclusions gatcontinue="Note|2980" />
  </query-continue>
  <query>
    <pages>
      <page pageid="1229" ns="0" title="Scale-out Block Setup (ceph)" />
      <page pageid="1274" ns="0" title="Scale-out Object Setup (ceph)" />
      <page pageid="1308" ns="0" title="HA Cluster Setup (JBODs)" />
      <page pageid="1315" ns="0" title="HA Cluster Setup (external SAN)" />
      <page pageid="2675" ns="0" title="Grid Configuration" />
    </pages>
  </query>
</api>